The Puerto Princesa Subterranean River National Park is located about 50 kilometers north of the city of Puerto Princesa, Palawan, Philippines. It is located in the Saint Paul Mountain Range on the northern coast of the island. The City Government of Puerto Princesa has managed the National Park since 1992. It is also known as St. Paul’s Subterranean River National Park, or St. Paul Underground River. The entrance to the Subterranean River is a short hike from the town of Sabang. Puerto Princesa Subterranean River National Park has been nominated for the “New Seven Wonders of Nature” competition.

The Park has a range of forest formations representing eight of the thirteen forest types found in tropical Asia, namely forest over ultramafic soils, forest over limestone soils, montane forest, freshwater swamp forest, lowland evergreen tropical rainforest, riverine forest, beach forest, and mangrove forest. Researchers have identified more than 800 plant species from 300 genera and 100 families. These include at least 295 trees dominated by the dipterocarp type of species.

Birds comprise the largest group of vertebrates found in the Park. Of the 252 bird species known to occur in Palawan, a total of 165 species of birds was recorded in the park from. This represents 67% of the total birds and all of the 15 endemic bird species of Palawan. Notable species seen in the park are the Blue-napped parrot (Tanygnathus lucionensis), Tabon scrub fowl (Megapodius cumunigii), Hill myna (Gracula religiosa), Palawan hornbill (Anthracoceros marchei), White breasted sea eagle (Halitutus leucogates ).

There are also some 30 mammal species that have been recorded (Madulid, 1998). Most often observed in the forest canopy and along the shoreline feeding during low tide is the long-tailed macaque (Macaca fascicularis), the only primate found in the area. Other mammal species in the Park are the Bearded pig (Sus barbatus), Bearcat (Arctictis binturong), Palawan stink badger (Mydaus marchei) and the Palawan porcupine (Hystrix pumilus)

19 species of reptiles have been identified, eight of which are endemic (Madulid, 1998). Common species in the area include large predators like the Common reticulated python (Phython reticulatus), the Monitor lizard (Varanus salvator) and the green crested lizard (Bronchocoela cristatella). Amphibian fauna include ten species. The Philippine woodland frog (Rana acanthi) is the most dominant and frequently encountered. One species, Barbourula busuangensis, endemic to Palawan was also observed in the area.

Notable are the nine species of bats, two species of swiftlets and whip spider (Stygophrynus sp.) found in the cave, and the Sea cow (Dugong dugon) and the Hawksbill sea turtle (Chelonia mydas) the feed in the coastal area of the Park.